Cq 25 Developer Bias Rap - 2515 - Xerox 2510 Service Manual

CQ
25
Developer Bias RAP
-
251 5
Switch off and unplug the copier
Ensure that the developer bias connector,
124, is seated correctly on the high voltage
power supply (HVPS) and the developer bias
lead is connected to the developer bias clip.
Set the meter to measure
+
400 VDC.
Connect the (-) to the GND test point on the
HVPS and the ( + ) to the developer bias clip.
Plug in and switch on the copier. Cheat the
AC interlock switch and the upper rear cover
interlock switch. Press Start; immediately
select the Light lnput mode.
The voltogo at the doveloper
bias
clip
changes from npproximatoly 0 VDC to
approximately 225 VDC when the copier
reaches L3.
The voltage at J25-8 of the High Voltage
Power Supply is approximately 6 VDC
when the copier goes from L9 to LO.
Switch off the copier and go to FLAG
2 and check the wiring for on open
circuit.
I
If
there
i s
no open circuit, replace
the
Control PWB (PL 1.1).
Switch off the copier and disconnect the
bias lead from the bias clip.
Ensure that the bias lead does not come
in contact with
the
copier frame.
Switch on the copier. Press Start;
immediately select the Light lnput mode.
The voltage at the developer bias clip
changes from approximately
0
VDC to
approximately 225 VDC when the copier
reaches L3.
Go to FLAG 1 and check the
developer bias lead for a short circuit
to frame or an open circuit.
If there i s no short circuit or open
circuit, replace the high voltage
power supply and perform the
Electrostatic Series (2510 ADJ 9.2;
251 5 9.3).
Check the developer housing for a short
circuit to frame.
A
Press Stop. Wait 15 seconds. Press Start; then
immediately select Dark Input.
The voltage at the deveioper bias clip will
change from 0 VDC to 225 VDC when the
copier reaches
L3.
The voltage will remain at
200 VDC for a maximum of 45 seconds after
the two beeps, and then drops to 0 VDC.
Check contrast control in run mode only.
Refer to the chart on page 3-79
Replace the high voltage power supply
and perform the Electrostatic Series
(25 10 ADJ 9.2; 25 15 ADJ 9.3).
Go to the copy quality RAP that directed you
here and conlinue lroublesl~oo~ing the copy
quality problem.
7/92
CQ 25 Developer Bias RAP
3-92 251 5